Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfce0e084f5a8eb…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 20:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 762889d2c97b37893af159587189bf70 SHA-1: 3ff9a445e30b31cb30ed46a1ba35376f513d9505 SHA-256: 9dfce0e084f5a8eb22e549912e40b869c11ba36cadff62c99122f00187858913
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised websites, a common technique for SEO poisoning or distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these linked PDFs. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://sipsak.nl/userfiles/file/givojov.pdf In PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/671b64153d5074c1b3bec187606c303a/xeliwolagiwame.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/20903288118.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/94182378504.pdfIn PDF document text
    • http://dytac.hk/userfiles/rewivimemaniwupoxef.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161353f235f178---57113414928.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161382a7406484---foduzujuzipu.pdfIn PDF document text
    • http://keitbg.com/images/files/17065879096.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/38529725413.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/59673322224.pdfIn PDF document text
    • http://centromp.it/userfiles/files/vopuratefujipofox.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mifuvodapeke.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/20153862892.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/guwofeberik.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/funitezoreriwudiw.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/suzikekusisakuwo.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/66420159369.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/4115446012.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdb1c7e3c7---butozob.pdfIn PDF document text
    • http://ttc-investco.com/img/files/45238265076.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/jagovomijexinuvibijovu.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/diremitevedegu.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/votobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=christmas+exercises+english+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 16640 bytes
SHA-256: 440c6e736c11acae1ecd9c07e01a14fa4ee71df2b66d0e6e4fbee733d0dffb5d
font_01_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 11080 bytes
SHA-256: 88544482a31e07d993b9c299bb4532d341f87b884cf2de022226bda7ce038cb9
font_02_sfnt_off00011f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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